Jack



June 26, 1951 H. w. volGT 2,558,401

JACK

\ Filed April 25, 194e Hansl W. Vo/'gf 1N VEN TOR.

Patented June Z6, 1951 `UNITED ,STATES `PATENT OFFICE JACK,

l Y Hans Voigt, Westfield, Tex.

Application April 23, 1946, Serial No. 664,225

1 claim. l

This invention relates to a jack.

An object of the invention is to provide a lifting jack designed forgeneral use and whose ratchet bar is provided with two sets of ratchetteeth, said jack being equipped with an operating handle with dogsmounted thereon arranged to alternately engage said ratchet faces as thehandle is oscillated, thereby providing a high speed jack.

It is another object of the invention to provide novel means forreleasing the dogs from the ratchet faces so that the ratchet bar may bemoved to initial position.

With the above and other objects in view, the invention has particularrelation to certain novel features of construction, operation andarrangement of parts, an example of which is given in this specificationand illustrated in the accompanying drawings, wherein:

Figure 1 is a side view of the jack.

Figure 2 is a fragmentary edge View.

Figure 3 is a horizontal, sectional view taken on the line 3 3 of Figure1, and

Figure 4 is an enlarged, fragmentary, vertical, sectional view ofanother form of ratchet bar.

Referring now more particularly to the drawings, wherein like numeralsof reference designate the same parts in each of the figures, thenumerals I, I designate the side bars of the frame which are spacedapart and which are secured in fixed relation by means of the upper,intermediate and lower .pairs of side plates 2, 3 and 4, the plates ofeach pair being arranged on opposite sides of the bars I and beingsecurely fastened thereto.

The numeral 5 designates a rectangular, boxlike foot piece in which thelower ends of the bars lare seated and secured, said foot piece having awide base 6.

Working between the bars I, I and between the plates which secure saidbars together, there is aratchet bar 'I having oppositely disposedratchet faces 8, 9. This may be an all metal bar, as indicated in Figure1, or it may be composed of wood with the ratchet teeth formed of metal,as indicated in Figure 4.

Secured to the upper end of the ratchet bar, there is a head piece I0.

There is an operating handle composed of the side bars II which embracethe side plates 2, 2 and are pivoted thereto as indicated in Figures 1and 3. This lever is provided with a grip member I2 at its outer end.

There are the dogs I3 and I4 whose upper ends are arranged to co-actwith corresponding ratchet faces 8 and 9. These dogs are pivoted betweenthe handle side bars, at intermediate points and their lower ends restagainst compression springs I5 and I6 which are interposed between theirlower ends and the corresponding side bars I. These springs operate tohold the dogs in engagement with the corresponding ratchet teeth A ofthe ratchet bar.

In operation, upon downward movement of the grip member I2, the dog I3will operate to lift the ratchet bar 'I while the dog I4 will pass overthe ratchet teeth 9 for a new hold. Upon reverse movement of the gripmember I2, the dog I4 will engage the teeth of the ratchet bar I andimpart a further movement to it while the dog I3 will pass over theratchet teeth 8 for a new hold, so that with each movement of the leverthe ratchet bar 'I will be advanced, thus producing a quick action jack.

In order to move the ratchet bar I back to initial position, both dogsmust be simultaneously released. In order to accomplish this, a sheaveI1 has been mounted to rotate on one of the side plates 3, and a cord I8has been connected to the lower end of the dog I3 and to the lowermargin of the said sheave, while a cord I9 has been connected to thelower end of the dog I4 and to the upper margin of said sheave. Byturning the sheave I'I to the left, the lower ends of the dogs may bepulled inwardly, thus releasing the upper ends thereof from the ratchetfaces of the bar I, so that said bar may be manually moved to initialposition.

The jack hereinabove described may be of any desired dimensions. Thelarger sizes will be very useful in construction work for lifting, ormoving, heavy loads while the smaller size jacks will be adapted for useas automobile jacks or for lifting similar loads.

Itis, of course, to be understood that structural changes may be madeand the proportions of the various parts varied so long as the principleof the invention is not departed from.

The drawings and description are illustrative merely, while the broadprinciple of the invention will be dened by the appended claim.

What I claim is:

A jack comprising, a frame having upstanding side bars spaced apart,upper, intermediate and lower pairs of side plates securing the sidebars in fixed relation, the plates of each pair being arranged onopposite sides of said bars, a boxlike, rectangular footpiece in whichthe lower ends of the bars are seated and secured, said footpiece havinga wide base, a ratchet bar which works between the side bars and betweenthe plates which secure the side bars together, said ratchet bar havingoppositely disposed ratchet faces, a headpiece secured to the upper endof the ratchet bar, an opposing handle composed of side bars whichembrace the upper side plates and are pivoted thereto, a grip secured tothe outer end of the handle side bars, dogs whose upper ends arearranged to co-act with the corresponding ratchet faces and which arepivoted between the handle side bars at intermediate points, compressionsprings interposed between the side bars and the lower ends of said dogsand which operate to hold the dogs in engagement with the correspondingratchet faces,v a

sheave mounted to rotate on one side of the frame, a pair of cordsconnected at their outex` ends to the lower ends of said dogs and attheir inner ends to the sheave at opposing points whereby the turning ofthe sheave will pull the lower ends of the dogs inwardly and release theupper ends of the dogs from said ratchet faces. HANS W. VOIGT.

REFERENCES CITED The following references are of record in the iile ofthis patent:

UNITED STATES PATENTS Number Name Date 958,969 Neal May 24, 19101,027,761 Purdy May 28, 1912

